Riddle



E. 0. STAMM.

FHDDLE.

APPLICATION FILED IULYII. l9l9.

Patented Feb. 14, 1922.

. other materials emp oyed by melders.

PATENT orFicE.;

EDGAR o. STAMM, or cmcinn'arr, omo.

RIDDLE.

T 0 all whom z'may concer/rt:

Y Be it known that I, EDGAR O. STAMM, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of hio, have invented certain new Iand useful Improvements in Riddles, of which the following is a specification.

My invention relates to improvements in riddles. One of its objects is to provide improved means'to support and operate one or more riddles ada ted to screen sand sind it l'l4 I other object is to provide an improved actuating mechanism` whereby the riddle is subjected to high speed vibrations of relatively short throw best adapted to the passage ol a maximum of material through the screen in a given period of time. Anotheil object is 'to provide improved actuating mechanism whereby maximum screening results are attainable with a given amount of power or energy. My invention also comprises certain details of form, combination, ,and arrangement, all of which will be fully set forth in the description of the accompanying drawings, in which;

Fig. 1 is a 'sideelevation of a riddle embodying my invention.

Fig. 2 is a sectional view on line 2 2 of ig. 3 is a sectional detail on line 3 3 of Fig. l.

Fig. ltis a sectional detail on line 4 l of Fig. 3.

Fig. 5 is a sectional detail, also on line 3 8 of Fig. 1.

Fig. 6 is a view similar to Fig. 2 illustrating a modification.

The accompanying dra vsingsillus rate the preferred embodiments of in v invention, in which l0 represents a frame which may be made of tubingr and pipe or similar fittings.y or if desired of more rigid and heavy material. The frame l0 may be adjustably supported upon ,a cable by means of wheels ll and l2 adapted to travel along the cable. or said frame may be rigidly attached to overhead parts of a building, or may be adapted to rest upon feet or legs supported upon the sand heap or floor. The frame lll serves as a support for the riddle or screen la and its actuating mechanism.

The screen prefer-.rbhr comprises an annular sheet metal band l5 which is rigidly attached to and supported by the stem 16 Specification of Letters Patent. Patentedfleb. 14, 1922.

Application ined July 11,

1919. Serial N0. 810,211.

at one end, and is slit at 17 vand its projections 18 and 19 held to etherbya clamping screw 20. Screen mem ers` comprising perforated bottoms 2l and continuous'annular sheet metal walls 22 are provided in duplicate with screen bottoms ofrdif'ferent sized mesh, and also different members having mesh ofthe same size, so that said members 21 may be interchangeably mounted in and relative to the members 15.

An electric motor, A or if preferred an air motor 28 is mounted upon the frame 10 and serves to rotatably drive the shaft 29. The shaft 29 at its lower end is provided with an eccentric 30 within a divided housing 31, in the Walls of which said shaft 29 is journaled. An eccentric strap 32 is located within the housing 31 and fitted to the eccentric by means of ball raceways 33 and 34 and balls 35 so ,as to` reciprocate said eccentric strap and its shank 36 relative to said housing at relatively high speed and short strokes, designed to impart to the screen a series of rapid and sharp vibrations to facilitate passage of ,a large amount of material through the screen per unit of time. The shaft 29v is preferably provided with thrust bearings 38 and 39, and .with ball journal bearings 40 and 4l, in order to take the strain and reduce the frictional resistance to aminimum. The housing' 31 is rigidly mounted with reference tothe frame 10.

The shank 36 of the eccentric strap 32 may be rigidly connected to the stem 16 of the screen so as to directl impart the thrusts or vibrations received y the eccentric strap to the screen, but I preferably provide a collar 42 on the shank 36 which collar is interposed between two spiral springs 43 and 44, seated in a recess 45 in the stem 16, and bearing against opposite ends of said recess, so that thrusts imparted to the shank 36 will be transmitted through the. springs 43 and 44 to the stem 16 and at the same time avoiding such sharp and periodically severe strains as to be liable to dama e the mechanism. By interchangeably emp oying springs of different grades of stiffne, a considerable range of adjustment may be had to suit the mechanism to the particular work in hand. h

ln the modification Fig. 6 I have illustrated two screens 14 and 14 both attached to an eccentric strap 32 substantially as heretofore described. and both receiving v1- bratory motion through a shaft 29 from a single motor such as illustrated in Fig. 1. In Fig. l a link 46 is pivotally connected at one end to the frame-'10 and at the opposite end to the stem 16 close to the screen 14 to support the screen and its contents'rela' 4housing V31 has a longitudinal and a lateral movement Within the slot 50, and I preferably provide a hood-of textile material 51 at this point to prevent dust or gritty material from entering the bearings or chamber of the housing 31. As illustrated in Fig. 5 -the shank 36 has two bearin s 52 and 53 in the stem-16, in which the s ank 36 moves endvvise with reference to the stem 16 to the extent that said springs 43 and 44 are oompressed at each stroke of the shank 36.

The apparatus herein illustrated and described is capable of considerable modification Without departing from the principle of my invention.

Wliat I claim is.

1. A riddle comprising a dependingly mounted supporting frame, a motor mount ed rigidly upon said frame and provided with a shaft to be rotatably driven, an eccentric mounted upon said shaft, an eccentric strap recipro'cally actuated by said eccentric, a housing inclosing said eccentric and eccentric stra and forming a bearing support for said s aft, and a screen member movably supported relative to said frame and connected to said eccentric strap to reciprocatorily energize said screen member.

2. A riddlconprising a depending supporting frame, a motor mounted rigidl upon said frame and provided with a sha t to be rotatably driven therefrom, a housing carried ri idly by said supporting frame in which sai shaft is journaled, an eccentric mounted upon said shaft Within said housing, an eccentric strap Within said housing reciprocally actuated by rsaid eccentric and having a shank extending outsideof said housing to vibratorily reciprocate a screen member, and a screen member movably supported relative to said frame and connected to said eccentric strap shank.

3. A riddle comprising a supporting frame, a motor mounted rigidly upon said frame and provided with a shaft to be lroe tatably driven, an eccentric mountedupon said shaft, an eccentric strap reciprocally actuated by said eccentric and provided with a reciprocally moving shank, a screen member dependin ly and movably mounted relative to said rame, and resilient connecting means tio transmit vibratory energy from said eccentric strap shank to said screen member.

4. A riddle comprisinga portabiesupJ porting frame, a motor mounted rigidly upon said supportin frame and provided with a downwardly cirected shaft'to be'rotatably driven thereby, a screen member dependingly and movably mounted relative to said frame, and resilient' connecting means interposed to transmit vibra-tory energy from said reciprocally motordriven member to said screen member, i

In testimony whereof I have affixed my signature.

EDGAR o. s'rAivnu. 

